Rock-drill.



T. E. ADAMS.

ROCK DRILL.

- APPLIoATIoN FILED AUG. 12-i 190s. 1,006,339, Patented 001.1112911.

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'HINIII il!i T. E. ADAMS.

ROCK DRILL.

APPLICATION FILED 11116.12. 190s.

INVEN'YOR fam..

NOGRAPH co.. WASHINGTON. D. c.

coLuMBIA PLA TI-IGMAS EDGAR ADAMS, 0F CLEVELAND, OHIO.

ROCK-Daim..

Specication of Letters Patent.

Patented Oct. 17, 1911.

Application filed August 12, 1908. Serial No. 448,228.

T 0 all whom it may concern:

Be it known that I, THOMAS E. ADAMS, of Cleveland, in the county ofCuyahoga and State of Ohio, have invented certain new and usefulImprovements in RocksDrills; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same. y

This invention relates to improvements in rock drills and machines ofkindred type,

the object of the invention being to provide a small machine which canbe'handled and controlled by'one man.

A further object is to so construct a machine of the hammer type that itshall comprise a few parts; so that it can be easily operated'andcontrolled, and so that the motor may be permitted to run withoutcausing the hammer to be reciprocated when the tool is not in contactwith the work.

With these objects in view the invention consists in certain novelfeatures of construction andy combinations of parts as hereinafter setforth and pointed out in the claims. In the accompanying drawings,Figure 1 is a longitudinal sectional view of a rock drill embodying myimprovements, and Fig. 2 is a similar view showing the hammer `head 23in its outer position and the member36 moved back. Y

1 represents the casing of an alternating current electric motor andwhich also forms the head of the drill.` The casing 1 is provided at oneside with an internally threaded annular flange 2 which receives abarrel 3, in the outer portion of which a bushing 4 is located. Attheother side the casing is provided with an annular flange 5 which isinternally threaded for the reception of a cap 6 having an enlargement 7provided with a hole to receive a handle 8. In order to prevent theturning of the cap 6 and the barrel 5 relatively to the casing l, springactuated locking-bolts 9-10 are provided and housed in hollowenlargements 11-12 on the casing 1. These locking bolts engage thebarrel 5 and cap6 respectively, in which position they are retained bymeans of springs 13 located within the hollow enlargements 12 andsurrounding the Shanks 14 of the locking bolts. The Shanks 14 projectupwardly or outwardly beyond the enlargements 12 so that they may begrasped when it is desired to disengage said locking bolts from thebarrel 3 and the cap 6. The stator of the motor is rigid with the casing1 and the latter is provided with openings 1.5 for the admission of airfor Ventilating purposes.V The rotor of the motor is constructed withVentilating passages 16 and is secured to a tubular shaft 17 havingbearings in bushings 18-19 located within the casing 1 at respectivesides thereof. The cap 6 is provided with a tubular extension 2() whichenters one end of the tubular shaft 17 and receives one end of a hammerrod or shank 21 so as to guide the movements of the same. The rod 21 ismade with a lubricant duct 21a which receives lubricant from a chamber20a formed' by the tubular extension 20. The forward end yof rod 21enters and is secured to a hub 22 having a cam 31 thereon, and lubricantis supplied toV said cam from the duct 21a through ports 22". The hub 22is provided at its forward end with a hammer head 23 to move in thatportion ofthe barrel 3 wherein the bushing 4 is located. The forward endof the barrel is made with an opening to aline with a similar opening inthe bushing, for the accommodation of an anvil or striking piece 24 tobe engaged by the hammer. The anvil 24 passes through a nose 25 at theforward end of the barrel 3 and is provided with a shoulder 24EL toengage the end of said nose. A socket is made in the anvil for thereception of a bit or tool 26 and the latter is made with flat faces 27to be engaged by the inner ends of screws 28 which pass through the ytubular portion of the anvil. The anvil is provided with openings 28awhich receive the inner ends of the screws 28 passing through the wallof the nose 25. In this manner, the bit is guided by the anvil andprevented from turning therein and at the same time the anvil ispermitted to change position to receive or not receive blows from thehammer 23.

When drilling downwardly the operator can turn the machine body by meansof the handle 8 to increase the rate of cutting and prevent the holefrom rifling. Y

A spring 29 encircles the rod or hammer stem 21 within the tubular shaft17, said spring bearing at one end against the tubular extension 20 ofcap 6 and at the other end against a shoulder 30 formed by the hub 22 atthe forward end of said rod or stem.

This spring serves to drive the hammer forwardly and causes it to engagethe striking piece 24 and thereby actuate the drill bit or tool 26.

The cam 31 on the hub 22 is approximately three fourths of a spiralconvolution. A collar 32 is secured to the tubular shaft 17 and isprovided with a forwardly projecting arm 33 to the free end of which apin 34 is secured. This pin projects from the arm 33 in a directiontoward the hub 22 and is provided with a roller 35 to engage the spiralcam 31. The pin 34 is provided in its free end with a groove 34a whichwill receive lubricant from the hub, and such lubricant will be thrownby centrifugal force from said groove and permitted to lubricate thebearing of the roller 35 on the pin 34.

From the construction and arrangement of parts above described, it isapparent that as the rotor of the motor turns, the engagement of theroller 35 on the pin 34 with the cam 3l, the hammer will be withdrawnuntil said roller passes the end of the cam, when the spring 29 willforce the hammer forwardly and cause the operation of the tool 26through the medium of the anvil or striking piece 24. If desired, morethan a single cam 31 and pin 34 may be employed. In order to effect suchoperation of the hammer as above described, it is necessary that thesame shall be prevented from turning when it is being withdrawn tocompress the spring 29 and for this purpose a bar 36 is pivotallysupported at one end and its other end is pressed toward the hammer headby means of a spring 37 so as to be engaged by any one of a series ofprojections 38 on said hammer head,-the coperation of said projectionwith the bar 36 permitting the hammer to move longitudinally butpreventing it from turning. The forward end of the bar 36 is providedwith a cam or beveled shoulder 39 to be engaged by the hammer head 23when the latter moves to the eXtreme end of its stroke. From thisconstruction it will be seen that when the tool or bit 26 is not incontact with the work, the spring 29 will force the hammer head to theeXtreme end of its stroke and the anvil or striking piece forwardlythrough the nose 25, the hammer head 23 engaging the cam or beveledshoulder 39 of the bar 36 and forcing said bar out of engagement andalinement with the projections 38 on the hammer head. Thus when the toolis not in contactY with the work, the motor can be permitted to runwithout operating the hammer because when the bar 36 is out of the pathof the projection 38, the hammer will rotate with the arm 33 and thetubular shaft of the rotor to which it is attached. In order to permitsuch rotative movement of the hammer, a comparatively light spring 39Lis seated at one end in a socket 39b in the rod 21, and

bears at its other end against a shoulder 39c on a rod 39d, the latterhaving a bearing in the upper end of the tubular extension 20 andpassing partially through the spring 39a. If the striking spring 29 ismade long enough to be under compression when the blow is struck, therewill be a recoil, but such recoil will be taken up by the light spring39a, the latter also serving to hold the hammer in rotative position. Assoon as the bit is pressed against the rock so as to move the strikingpiece 24 and the hammer head 23 rearwardly a short distance, the bar 36will be promptly pressed by the spring 37 in position to be engaged byone of the projections 38 and the operation of the drill will at oncebecome effective.

If desired the bar 36 may be provided with a projection 40 passingthrough a hole in the barrel 3, whereby the operator can control thestarting and stopping of the effective operation of the hammer and bitmanually.

The electrical connections for the motor may be eifected by means of aseries of iingers 52 properly connected with the motor coils andprojecting into a socket 53 at one end or side of the casing 1, andcoperating with a series of socket pieces 54 carried by a block 55 ofinsulating material adapted to be inserted into the socket 53, thesockets 54 being adapted for connection with a source of electricalenergy which in the present instance may be a three phase alternatingcurrent.

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is

1. In a drill, the combination with a hammer, a motor, a movable tool,and means for reciprocating the hammer to operate the tool, of meansoperating automatically to permit the inoperation of the hammer whilethe motor is running and when the tool is not in operative relation tothe work.

2. In a'drill, thecombination with a hammer, a movable tool, a motor,and means for operating the hammer to operate the-tool, of meansoperating automatically'to permit the inoperation of the hammer whilethe motor is running and the tool is not in op# erative relation to thework and operated by the tool when pressed against the work to permitthe operation of the hammer operating means.

3. In a drill, the combination with a casing and a motor therein, of amovable tool, a hammer to operate the tool and having a projectionthereon, a cam on said hammer, an arm secured to the rotary member ofthe motor and having a pin coperating with said cam to withdraw thehammer, a spring for propelling the hammer, a pivoted arm to engage theprojection on the hammer and prevent the rotation of the latter, and afinger piece on said arm for moving the same out of the path of theprojection on the hammer.

4. In a drill, the combination with a casing, a motor therein and atubular shaft to which the rotary member of said motor is secured, of acap secured to the casing and having a tubular projection entering saidtubular shaft, an arm secured to the other end of the tubular shaft, ahammer provided with a cam to coperate with said arm, a shank projectingfrom the hammer, passing partially through the tubular shaft and guidedin the tubular extension on said cap, a spring encircling the hammershank and bearing at one end against the tubular eX tension on the cap,a shoulder at the forward end of the hammer shank against which theother end of said spring bears, and an anvil to be engaged by thehammer.

5. In a drill, the combination with a casing and a motor therein, of ahammer, a cam carried thereby, an arm secured to the rotary member ofthe motor and coperating with said cam, a spring for propelling thehammer, a striking piece-or anvil to be engaged by the hammer,projections on the hammer, a spring pressed bar to be engaged by any oneof said projections to prevent the rotation of the hammer, and a cam orbeveled shoulder on said movable baiI in position to be engaged by thehammer, whereby said bar will be moved out of the path of theprojections on the hammer when the latter reaches the forward extremityof its thro-w and the tool actuated by the anvil is not pressing againstthe Work.

6. In a drill, the combination with a casing and a motor therein, of abarrel attached to said casing, a spring actuated locking bolt securingthe barrel to the casing and preventing the rotation of one relativelyto that of the other, a cap on the other side of said casing, a springactuated locking bolt carried by the casing and engaging said cap, ahammer disposed in said barrel, a cam carried by the hammer, an armcarried by the rotary member of the motor and cooperating with said camto withdraw the hammer, a spring to propel the hammer forwardly, and astriking piece mounted in the nose of the barrel and adapted to beengaged by said hammer.

7. The combination of an anvil to operate a tool, a hammer, meansincluding a motor for reciprocating the hammer, and mechanical devicescontrolled by the position of the anvil for controlling thereciprocation of the hammer while the motor is running.

In testimony whereof, I have signed this specication in the presence oftwo subscribing witnesses.

THOMAS EDGAR ADAMS.

Vitnesses:

C. A. I-IosKINs, A. L. -I-IOKING.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

